eval() (Was: One more update on d-programming-language.org)

[dennis luehring]

On 15.09.2010 22:19, Nick Sabalausky wrote:
> "Philippe Sigaud"<philippe.sigaud at gmail.com>  wrote in message
> news:mailman.214.1284496545.858.digitalmars-d at puremagic.com...
>> On Tue, Sep 14, 2010 at 17:01, Andrei Alexandrescu<
>> SeeWebsiteForEmail at erdani.org>  wrote:
>>>
>>>   I think we'll move forward with that one. I'll start working on the
>> content. Ideas for good tutorial examples?
>>>
>>
>> Maybe more examples of what's interesting me right now than tutorials, but
>> who knows?
>>
>> * executing command-lines instructions from a D program. Theme: file I/O,
>> OS
>> interaction.
>> An interesting example is having a script that loads a D file, modifies
>> its
>> source, asks for DMD to compile it and then runs it and get its result. It
>> could be the first brick to get a REPL / idmd (interactive dmd). Maybe
>> more
>> a [challenge] subject than a tutorial example?
>>
>
> One thing that could be used for that is the eval() function I've recently
> added to my SemiTwist D Tools library:
>
> http://www.dsource.org/projects/semitwist/browser/trunk/src/semitwist/util/process.d
>
> Example:
> -----------------------------
> import semitwist.util.all;
> void main()
> {
>      auto x = eval!int(q{ return 21 * 2; }); // String can be
> runtime-generated
>      assert(x == 42);
>
>      eval!void( q{ writeln("Hello World"); }, q{ import std.stdio; } );
> }
> -----------------------------

is that something like an "runtime" mixin

would be great to have something like that in the standard - then i can 
stop writing my own script interpreter for my at runtime loaded DSLs :-)

(and my dream is that walter can use something like that internaly for 
CTFEs)